.ch-1 {
  top: 1px;
  right: 2px;
  bottom: 3px;
  left: 4px;
}
.ch-2 {
  prefix-top-suffix: 1px;
  prefix-bottom-suffix: 2px;
  prefix-left-suffix: 3px;
  prefix-right-suffix: 2px;
}
.a {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}
.f {
  position: fixed;
  bottom: 10px;
  left: 10px;
}
.r {
  position: relative;
  left: 5px;
}
.p {
  padding-top: 1em;
  padding-right: 2em;
  padding-bottom: 1em;
  padding-left: 2em;
}
.m {
  margin-bottom: 2em;
}
.bc {
  border-top-color: red;
  border-right-color: blue;
}
.bs {
  border-right-style: solid;
  border-bottom-style: dotted;
}
.bw {
  border-right-width: 2px;
  border-left-width: 2px;
}
